The Basic Practice of Statistics 7th Edition

Published by W. H. Freeman
ISBN 10: 146414253X
ISBN 13: 978-1-46414-253-6

Chapter 11 - Producing Data: Part II Review - Test Yourself - Page 271: 11.15

Answer

(b) an observational study

Work Step by Step

The nonverbal IQ test and eye exam are not treatments, so this is an observational study.
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